iPXE
Macros | Functions
com32_call.c File Reference
#include <stdint.h>
#include <realmode.h>
#include <comboot.h>
#include <assert.h>
#include <ipxe/uaccess.h>

Go to the source code of this file.

Macros

#define com32_regs   __use_data16 ( com32_regs )
 
#define com32_int_vector   __use_data16 ( com32_int_vector )
 
#define com32_farcall_proc   __use_data16 ( com32_farcall_proc )
 

Functions

 FILE_LICENCE (GPL2_OR_LATER)
 
static com32sys_t __bss16 (com32_regs)
 
static uint8_t __bss16 (com32_int_vector)
 
static uint32_t __bss16 (com32_farcall_proc)
 
uint16_t __bss16 (com32_saved_sp)
 
void __asmcall com32_intcall (uint8_t interrupt, physaddr_t inregs_phys, physaddr_t outregs_phys)
 Interrupt call helper. More...
 
void __asmcall com32_farcall (uint32_t proc, physaddr_t inregs_phys, physaddr_t outregs_phys)
 Farcall helper. More...
 
int __asmcall com32_cfarcall (uint32_t proc, physaddr_t stack, size_t stacksz)
 CDECL farcall helper. More...
 

Macro Definition Documentation

◆ com32_regs

#define com32_regs   __use_data16 ( com32_regs )

Definition at line 34 of file com32_call.c.

◆ com32_int_vector

#define com32_int_vector   __use_data16 ( com32_int_vector )

Definition at line 37 of file com32_call.c.

◆ com32_farcall_proc

#define com32_farcall_proc   __use_data16 ( com32_farcall_proc )

Definition at line 40 of file com32_call.c.

Function Documentation

◆ FILE_LICENCE()

FILE_LICENCE ( GPL2_OR_LATER  )

◆ __bss16() [1/4]

static com32sys_t __bss16 ( com32_regs  )
static

◆ __bss16() [2/4]

static uint8_t __bss16 ( com32_int_vector  )
static

◆ __bss16() [3/4]

static uint32_t __bss16 ( com32_farcall_proc  )
static

◆ __bss16() [4/4]

uint16_t __bss16 ( com32_saved_sp  )

◆ com32_intcall()

void __asmcall com32_intcall ( uint8_t  interrupt,
physaddr_t  inregs_phys,
physaddr_t  outregs_phys 
)

Interrupt call helper.

Definition at line 47 of file com32_call.c.

47  {
48 
49  DBGC ( &com32_regs, "COM32 INT%x in %#08lx out %#08lx\n",
50  interrupt, inregs_phys, outregs_phys );
51 
52  memcpy ( &com32_regs, phys_to_virt ( inregs_phys ),
53  sizeof ( com32sys_t ) );
54 
55  com32_int_vector = interrupt;
56 
57  __asm__ __volatile__ (
58  REAL_CODE ( /* Save all registers */
59  "pushal\n\t"
60  "pushw %%ds\n\t"
61  "pushw %%es\n\t"
62  "pushw %%fs\n\t"
63  "pushw %%gs\n\t"
64  /* Mask off unsafe flags */
65  "movl (com32_regs + 40), %%eax\n\t"
66  "andl $0x200cd7, %%eax\n\t"
67  "movl %%eax, (com32_regs + 40)\n\t"
68  /* Load com32_regs into the actual registers */
69  "movw %%sp, %%ss:(com32_saved_sp)\n\t"
70  "movw $com32_regs, %%sp\n\t"
71  "popw %%gs\n\t"
72  "popw %%fs\n\t"
73  "popw %%es\n\t"
74  "popw %%ds\n\t"
75  "popal\n\t"
76  "popfl\n\t"
77  "movw %%ss:(com32_saved_sp), %%sp\n\t"
78  /* patch INT instruction */
79  "pushw %%ax\n\t"
80  "movb %%ss:(com32_int_vector), %%al\n\t"
81  "movb %%al, %%cs:(com32_intcall_instr + 1)\n\t"
82  /* perform a jump to avoid problems with cache
83  * consistency in self-modifying code on some CPUs (486)
84  */
85  "jmp 1f\n"
86  "1:\n\t"
87  "popw %%ax\n\t"
88  "com32_intcall_instr:\n\t"
89  /* INT instruction to be patched */
90  "int $0xFF\n\t"
91  /* Copy regs back to com32_regs */
92  "movw %%sp, %%ss:(com32_saved_sp)\n\t"
93  "movw $(com32_regs + 44), %%sp\n\t"
94  "pushfl\n\t"
95  "pushal\n\t"
96  "pushw %%ds\n\t"
97  "pushw %%es\n\t"
98  "pushw %%fs\n\t"
99  "pushw %%gs\n\t"
100  "movw %%ss:(com32_saved_sp), %%sp\n\t"
101  /* Restore registers */
102  "popw %%gs\n\t"
103  "popw %%fs\n\t"
104  "popw %%es\n\t"
105  "popw %%ds\n\t"
106  "popal\n\t")
107  : : );
108 
109  if ( outregs_phys ) {
110  memcpy ( phys_to_virt ( outregs_phys ),
111  &com32_regs, sizeof ( com32sys_t ) );
112  }
113 }
com32_regs
#define com32_regs
Definition: com32_call.c:34
DBGC
#define DBGC(...)
Definition: compiler.h:505
memcpy
void * memcpy(void *dest, const void *src, size_t len) __nonnull
com32sys_t
Definition: comboot.h:44
__volatile__
__asm__ __volatile__("call *%9" :"=a"(result), "=c"(discard_ecx), "=d"(discard_edx) :"d"(0), "a"(code), "b"(0), "c"(in_phys), "D"(0), "S"(out_phys), "m"(hypercall))
__asm__
__asm__(".section \".rodata\", \"a\", " PROGBITS "\n\t" "\nprivate_key_data:\n\t" ".size private_key_data, ( . - private_key_data )\n\t" ".equ private_key_len, ( . - private_key_data )\n\t" ".previous\n\t")
REAL_CODE
#define REAL_CODE(asm_code_str)
Definition: libkir.h:226
com32_int_vector
#define com32_int_vector
Definition: com32_call.c:37
interrupt
void interrupt(int intr, struct interrupt_frame32 *frame32, struct interrupt_frame64 *frame64)
Interrupt handler.
Definition: librm_mgmt.c:251

References __asm__(), __volatile__(), com32_int_vector, com32_regs, DBGC, interrupt(), memcpy(), and REAL_CODE.

◆ com32_farcall()

void __asmcall com32_farcall ( uint32_t  proc,
physaddr_t  inregs_phys,
physaddr_t  outregs_phys 
)

Farcall helper.

Definition at line 118 of file com32_call.c.

118  {
119 
120  DBGC ( &com32_regs, "COM32 farcall %04x:%04x in %#08lx out %#08lx\n",
121  ( proc >> 16 ), ( proc & 0xffff ), inregs_phys, outregs_phys );
122 
123  memcpy ( &com32_regs, phys_to_virt ( inregs_phys ),
124  sizeof ( com32sys_t ) );
125 
126  com32_farcall_proc = proc;
127 
128  __asm__ __volatile__ (
129  REAL_CODE ( /* Save all registers */
130  "pushal\n\t"
131  "pushw %%ds\n\t"
132  "pushw %%es\n\t"
133  "pushw %%fs\n\t"
134  "pushw %%gs\n\t"
135  /* Mask off unsafe flags */
136  "movl (com32_regs + 40), %%eax\n\t"
137  "andl $0x200cd7, %%eax\n\t"
138  "movl %%eax, (com32_regs + 40)\n\t"
139  /* Load com32_regs into the actual registers */
140  "movw %%sp, %%ss:(com32_saved_sp)\n\t"
141  "movw $com32_regs, %%sp\n\t"
142  "popw %%gs\n\t"
143  "popw %%fs\n\t"
144  "popw %%es\n\t"
145  "popw %%ds\n\t"
146  "popal\n\t"
147  "popfl\n\t"
148  "movw %%ss:(com32_saved_sp), %%sp\n\t"
149  /* Call procedure */
150  "lcall *%%ss:(com32_farcall_proc)\n\t"
151  /* Copy regs back to com32_regs */
152  "movw %%sp, %%ss:(com32_saved_sp)\n\t"
153  "movw $(com32_regs + 44), %%sp\n\t"
154  "pushfl\n\t"
155  "pushal\n\t"
156  "pushw %%ds\n\t"
157  "pushw %%es\n\t"
158  "pushw %%fs\n\t"
159  "pushw %%gs\n\t"
160  "movw %%ss:(com32_saved_sp), %%sp\n\t"
161  /* Restore registers */
162  "popw %%gs\n\t"
163  "popw %%fs\n\t"
164  "popw %%es\n\t"
165  "popw %%ds\n\t"
166  "popal\n\t")
167  : : );
168 
169  if ( outregs_phys ) {
170  memcpy ( phys_to_virt ( outregs_phys ),
171  &com32_regs, sizeof ( com32sys_t ) );
172  }
173 }
com32_regs
#define com32_regs
Definition: com32_call.c:34
DBGC
#define DBGC(...)
Definition: compiler.h:505
memcpy
void * memcpy(void *dest, const void *src, size_t len) __nonnull
com32sys_t
Definition: comboot.h:44
com32_farcall_proc
#define com32_farcall_proc
Definition: com32_call.c:40
__volatile__
__asm__ __volatile__("call *%9" :"=a"(result), "=c"(discard_ecx), "=d"(discard_edx) :"d"(0), "a"(code), "b"(0), "c"(in_phys), "D"(0), "S"(out_phys), "m"(hypercall))
__asm__
__asm__(".section \".rodata\", \"a\", " PROGBITS "\n\t" "\nprivate_key_data:\n\t" ".size private_key_data, ( . - private_key_data )\n\t" ".equ private_key_len, ( . - private_key_data )\n\t" ".previous\n\t")
REAL_CODE
#define REAL_CODE(asm_code_str)
Definition: libkir.h:226

References __asm__(), __volatile__(), com32_farcall_proc, com32_regs, DBGC, memcpy(), and REAL_CODE.

◆ com32_cfarcall()

int __asmcall com32_cfarcall ( uint32_t  proc,
physaddr_t  stack,
size_t  stacksz 
)

CDECL farcall helper.

Definition at line 178 of file com32_call.c.

178  {
179  int32_t eax;
180 
181  DBGC ( &com32_regs, "COM32 cfarcall %04x:%04x params %#08lx+%#zx\n",
182  ( proc >> 16 ), ( proc & 0xffff ), stack, stacksz );
183 
184  copy_to_rm_stack ( phys_to_virt ( stack ), stacksz );
185  com32_farcall_proc = proc;
186 
187  __asm__ __volatile__ (
188  REAL_CODE ( "lcall *%%ss:(com32_farcall_proc)\n\t" )
189  : "=a" (eax)
190  :
191  : "ecx", "edx" );
192 
193  remove_from_rm_stack ( NULL, stacksz );
194 
195  return eax;
196 }
com32_regs
#define com32_regs
Definition: com32_call.c:34
DBGC
#define DBGC(...)
Definition: compiler.h:505
remove_from_rm_stack
void remove_from_rm_stack(void *data, size_t size)
Deallocate space on the real-mode stack, optionally copying back data.
Definition: librm_mgmt.c:82
copy_to_rm_stack
uint16_t copy_to_rm_stack(const void *data, size_t size)
Allocate space on the real-mode stack and copy data there.
Definition: librm_mgmt.c:67
com32_farcall_proc
#define com32_farcall_proc
Definition: com32_call.c:40
__volatile__
__asm__ __volatile__("call *%9" :"=a"(result), "=c"(discard_ecx), "=d"(discard_edx) :"d"(0), "a"(code), "b"(0), "c"(in_phys), "D"(0), "S"(out_phys), "m"(hypercall))
eax
uint32_t eax
Definition: string.h:234
__asm__
__asm__(".section \".rodata\", \"a\", " PROGBITS "\n\t" "\nprivate_key_data:\n\t" ".size private_key_data, ( . - private_key_data )\n\t" ".equ private_key_len, ( . - private_key_data )\n\t" ".previous\n\t")
int32_t
signed int int32_t
Definition: stdint.h:17
REAL_CODE
#define REAL_CODE(asm_code_str)
Definition: libkir.h:226
NULL
#define NULL
NULL pointer (VOID *)
Definition: Base.h:321

References __asm__(), __volatile__(), com32_farcall_proc, com32_regs, copy_to_rm_stack(), DBGC, eax, NULL, REAL_CODE, and remove_from_rm_stack().

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